JP2003041626A - Slewing construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the adjusting works of a sheathing cover installed to a bottom plate through a bracket by reducing the weld strain of the bottom plate for a revolving frame, and to improve productivity. SOLUTION: An additional weight 37 mounted on the underside rear side of the bottom plate 32 for the revolving frame 31 is constituted so as to form a size broader in the horizontal direction than the rear plate section 33B of a left vertical plate 33 and a breadth in which a right vertical plate 34 is erected. Accordingly, the bottom plate 32 can be reinforced by the firm additional weight 37 formed as a heavy article by integrally fixing the weight 37 onto the underside of the bottom plate 32 by a welding before the left vertical plate 33 and the right vertical plate 34 are welded onto the bottom plate 32 for the revolving frame 31. Consequently, weld strain at a time when each vertical plate 33 and 34 is welded onto the bottom plate 32 can be limitted to a small value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swiveling construction machine such as a hydraulic excavator for excavating earth and sand.

[0002]

2. Description of the Related Art Generally, a hydraulic excavator is known as a swing type construction machine. The hydraulic excavator includes a lower traveling body, an upper rotating body rotatably provided on the lower traveling body, The work device is provided on the front side of the upper revolving structure so as to be able to move up and down. Further, as the hydraulic excavator, there is a small hydraulic excavator called a mini excavator.

Therefore, the structure of a conventional small hydraulic excavator will be described with reference to FIGS. 6 to 11.

Reference numeral 1 is an undercarriage, 2 is an upper revolving structure mounted on the lower traveling structure 1 via a revolving device 3 so as to be rotatable, and excavation work or the like is performed on the front side of the upper revolving structure 2. The working device 4 for the above is provided so that it can be lifted and lowered. And
As shown in FIG. 7, the upper revolving superstructure 2 is roughly constituted by a revolving frame 5, a counterweight 11, an additional weight 12, an engine 13 and the like, which will be described later.

Reference numeral 5 denotes a swivel frame forming a support structure for the upper swivel body 2. The swivel frame 5 is shown in FIGS.
As shown in FIG. 1, a bottom plate 6, a left vertical plate 7, a right vertical plate 8, an upper plate 9 and the like, which will be described later, are roughly configured.

Reference numeral 6 is a bottom plate which forms the base of the revolving frame 5.
The bottom plate 6 is formed into a substantially circular shape by combining a plurality of plate bodies. Further, at the front part of the bottom plate 6, a lower support plate 6A (shown in FIGS. 9 and 11) for swingably supporting the working device 4 in the left and right directions together with an upper plate 9 described later is directed to the front side. Has been extended.

Reference numeral 7 is a left vertical plate which is erected on the upper surface of the bottom plate 6,
As shown in FIG. 8, the left vertical plate 7 includes a front plate portion 7A diagonally extending leftward from the left side portion of the lower support plate 6A toward the rear side,
The front plate portion 7A and the rear plate portion 7B which is bent from the rear end portion of the front plate portion 7A and extends straight to the rear side are formed in a substantially V shape. The left vertical plate 7 is integrally fixed to the upper surface of the bottom plate 6 by using welding means.

Reference numeral 8 is a right vertical plate which is erected on the upper surface of the bottom plate 6,
The right vertical plate 8 is arranged at a distance from the left vertical plate 7 in the left and right directions, and extends linearly from the right side portion of the lower support plate 6A toward the rear side. The right vertical plate 8 is integrally fixed to the upper surface of the bottom plate 6 by using welding means, like the left vertical plate 7.

Reference numeral 9 is a substantially triangular upper plate provided so as to cover the front portions of the left vertical plate 7 and the right vertical plate 8 from above, and the front portion of the upper plate 9 is a lower support plate. The upper support plate 9A faces 6A.

An outer ring 10 constitutes a part of the turning device 3 provided on the bottom plate 6 of the turning frame 5. The outer ring 10 is
It has a large diameter and a short cylindrical shape. And outer ring 1
The number 0 is fixed to the lower surface of the bottom plate 6 around the center of rotation of the upper swing body 2.

Reference numeral 11 denotes a counterweight provided on the rear end side of the revolving frame 5 to balance the weight with the working device 4 (see FIG. 6), and the counterweight 11 is formed along an arc of a revolving radius. Has been done. Here, the counterweight 11 needs a large weight in order to balance the weight with the working device 4. However, in a small hydraulic excavator, the space for installing the counterweight 11 is limited, and the rear visibility is deteriorated, so that it cannot be increased upward. Therefore, in order to obtain a large weight, an additional weight 12 described later is provided on the rear side of the revolving frame 5.

Reference numeral 12 denotes an additional weight provided on the rear side of the revolving frame 5, and the additional weight 12 cooperates with the counterweight 11 to balance the weight with the working device 4. Here, as shown in FIG. 11, the additional weight 12 has dimensions in the front and rear directions that are different from the rear end portion of the bottom plate 6 and the outer ring 1.
It is set to a size that can be accommodated between 0 and 0, and the lateral width in the left and right directions is set to be a size that can be accommodated between the rear plate portion 7B of the left vertical plate 7 and the right vertical plate 8. Then, the additional weight 12 is provided with a fixing means such as fillet welding on the peripheral edge thereof so that the bottom plate 6
Is integrally fixed to the lower surface of the.

Here, the additional weight 12 has a lateral width dimension that can be accommodated between the rear plate portion 7B of the left vertical plate 7 and the right vertical plate 8 so that the bottom plate 6, the left and right vertical plates of the revolving frame 5 can be accommodated. 7,
The load (moment) acting on 8 and the like is well balanced, and the appearance when mounted on the turning frame 5 is good.

Reference numeral 13 denotes an engine located on the front side of the counterweight 11 and provided on the rear side of the revolving frame 5.
The engine 13 is arranged in a horizontal state extending in the left and right directions. A hydraulic pump 14 is attached to the left end of the engine 13, and a radiator 15 and an oil cooler 16 are provided on the right end of the engine 13 so as to face a cooling fan (not shown) driven by the engine 13. Has been done.

Reference numeral 17 designates a hydraulic oil tank which is located on the front side of the radiator 15 and the like and is provided on the revolving frame 5, and on the front side of the hydraulic oil tank 17, a control valve group 18 in which a plurality of control valves are connected is arranged. It is set up. Further, 19 is a turning frame 5
The fuel tank provided on the left side of FIG.

Reference numeral 20 denotes a driver's seat provided on the revolving frame 5 (see FIG. 6), and the periphery of the driver's seat 20 is the engine 1
3. An outer cover 21 is provided from the rear side to the right front side so as to cover the hydraulic oil tank 17 and the like, and the outer cover 21 is attached to a bracket (not shown) provided on the bottom plate 6 and the like of the revolving frame 5. Has been. The upper part of the driver's seat 20 is covered with a canopy 22. Further, in the vicinity of the driver's seat 20, operation levers 23, 24, etc. for operating the lower traveling body 1, the work device 4, etc. are arranged.

The small-sized hydraulic excavator according to the prior art constructed as described above is moved while moving the lower traveling body 1 by operating the operation levers 23 and 24 while sitting on the driver's seat 20. The work device 4 can be raised and lowered to perform earth and sand excavation work and the like. Further, when the working device 4 is working, the counterweight 11 and the additional weight 12 provided on the rear side of the revolving frame 5 balance the weight of the working device 4 and stabilize the working posture.

[0018]

However, in the hydraulic excavator according to the above-mentioned prior art, when the additional weight 12 is attached to the bottom plate 6 of the turning frame 5, the turning frame 5 is rotated.
Load evenly acting on each part of the
2 looks good.

The bottom plate 6 of the revolving frame 5 has the left vertical plate 7, the right vertical plate 8 and the like welded to the upper surface thereof, and the additional weight 12 and the like welded to the lower surface thereof. The bottom plate 6 may be distorted due to the welding of the additional weight 12. In particular, when the vertical plates 7 and 8 are welded to the bottom plate 6 along the front and rear directions, the left and right sides of the bottom plate 6 may be deformed so as to warp.

As described above, when welding distortion occurs in the bottom plate 6 of the revolving frame 5, the bracket provided on the bottom plate 6 falls, so that the mounting positions of the exterior cover 21 and the like mounted on the bracket are displaced. As a result, a large step or a gap is formed at the joint of the outer cover 21 and the appearance becomes poor. For this reason, when the exterior cover 21 is attached, it takes time to adjust the step and the gap, and there is a problem that productivity is reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to reduce the welding distortion of the bottom plate of the revolving frame, thereby simplifying the adjustment work when, for example, attaching an exterior cover or the like. It is to provide a swing-type construction machine which has been improved in productivity.

[0022]

A turning construction machine according to the present invention is a self-propelled lower traveling structure, an upper revolving structure rotatably mounted on the lower traveling structure, and a front side of the upper revolving structure. The upper revolving structure comprises a bottom plate and a left vertical plate extending forward and backward on the upper surface of the bottom plate and standing vertically with a space in the left and right directions. A revolving frame having a plate, a counterweight provided on the rear end side of the revolving frame for balancing the weight of the working device, and an additional member fixed to the lower surface of the bottom plate located on the rear side of the revolving frame. It has a weight.

Then, in order to solve the above-mentioned problems,
The feature of the configuration adopted by the invention of claim 1 is that the additional weight is formed wider in the left and right directions than the lateral width in which the left vertical plate and the right vertical plate of the revolving frame are erected.

With this structure, before the left vertical plate and the right vertical plate are welded to the bottom plate of the revolving frame, the additional weight is integrally fixed to the rear surface of the lower surface of the bottom plate by using welding means. As a result, the strong additional weight formed as a heavy object has left and right side plates that cross the left and right vertical plates to the left,
Since it extends to the right, it is possible to reinforce the portion of the bottom plate to which each vertical plate is welded. Therefore, the additional weight can reduce distortion of the bottom plate when welding the vertical plates.

According to the second aspect of the present invention, the engine is provided on the rear side of the revolving frame in front of the counterweight, and the additional weight is placed on the lower side of the engine to average the entire weight balance. There is a balance adjustment hole to do this.

With this configuration, when the additional weight is attached to the bottom plate of the revolving frame, the balance adjusting holes formed in the additional weight average the weight balance of the entire body, so that a load is applied to a part of the bottom plate. It is possible to prevent concentration. Moreover, since the balance adjustment hole is provided on the lower side of the engine, the balance adjustment hole can be easily used when performing, for example, engine maintenance work (engine oil replacement work) or inspection work. You can

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a small hydraulic excavator will be taken as an example of a swing-type construction machine according to an embodiment of the present invention,
This will be described in detail with reference to FIGS. In addition, in the present embodiment, the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

Reference numeral 31 is a swivel frame according to the present embodiment. The swivel frame 31 has a lower support plate 32A (FIG. 2, FIG. 2) at its front portion, which is similar to the swivel frame 5 described in the prior art.
A substantially circular bottom plate 32 in which (in FIG. 4) is extended,
A left vertical plate 33 that is formed in a substantially V-shape and is erected on the upper surface of the bottom plate 32, and has a front plate portion 33A that obliquely extends leftward toward the rear side and a rear plate portion 33B that extends straight rearward. A right vertical plate 34 which is erected at a distance from the left vertical plate 33 in the left and right directions and linearly extends rearward from the lower support plate 32A,
The left vertical plate 33 and the right vertical plate 34 are provided so as to cover the front side from the upper side, and are substantially configured by a substantially triangular upper plate 35 having an upper support plate 35A facing the lower support plate 32A at the front. Has been done. The left vertical plate 33 and the right vertical plate 34 are
As shown in FIG. 3, it is fixed to the upper surface of the bottom plate 32 in an upright state by fixing means such as fillet welding. Also, the upper plate 3
The same fixing means 5 is fixed to the left vertical plate 33 and the right vertical plate 34.

Here, on the rear side of the bottom plate 32, two through holes 32B and 32C are provided below the engine 13, and these through holes 32B and 32C are used for exchanging engine oil, transmission oil, etc. It is provided to perform work, maintenance work for the engine 13, the radiator 15, the oil cooler 16 and the like, and inspection work for these. Further, the rear plate portion 33B of the left vertical plate 33 and the right vertical plate 34 have a lateral width W so as to sandwich the through holes 32B and 32C.
Spaced in parallel with 1. Further, the bottom plate 32
An outer ring 36 is attached to the lower surface of the center of the outer ring.

Next, 37 is an additional weight provided on the rear side of the revolving frame 5 according to the present embodiment. The additional weight 37 is made of a strong thick plate formed as a heavy object, and the counterweight 11 is provided. In cooperation with the working device 4 to balance the weight. As shown in FIGS. 4 and 5, the additional weight 37 has a concave side portion 37A on the front side so as to avoid the outer ring 36, and an arc side portion 37B along the rear portion of the bottom plate 32 on the rear side. This allows
The front side and the rear side of the additional weight 37 are efficiently housed between the rear end portion of the bottom plate 32 and the outer ring 36.

Further, the lateral width W2 of the additional weight 37 in the left and right directions is determined by the rear plate portion 33B of the left vertical plate 33 and the right vertical plate 3.
The width is set to be larger (wider) than the width W1 of 4 and. As a result, in the state where the additional weight 37 is fixed to the lower surface of the bottom plate 32 of the revolving frame 31, both sides in the left and right directions exceed the rear plate portion 33B of the left vertical plate 33 and the portion where the right vertical plate 34 is welded. And extends wide. Therefore, before the left vertical plate 33 and the right vertical plate 34 are welded to the upper surface of the bottom plate 32, the additional weight 37 is integrally fixed to the rear side of the lower surface of the bottom plate 32 by a fixing means such as fillet welding. Since the rear portion of the bottom plate 32 is reinforced by including the welded portions of the vertical plates 33 and 34, the bottom plate 32 when the vertical plates 33 and 34 are welded
It is possible to suppress the welding distortion of.

Reference numeral 38 is a balance adjusting hole provided on the additional weight 37 located below the engine 13, and the balance adjusting hole 38 is formed through the through hole 3 formed in the bottom plate 32.
It is formed by a first adjustment hole 38A corresponding to 2B and a second adjustment hole 38B corresponding to the through hole 32C. The balance adjusting hole 38 is provided with the additional weight 37.
When is attached to the bottom plate 32 of the revolving frame 31, the weight balance of the entire bottom plate 32 is averaged to prevent the load from being concentrated on a part of the bottom plate 32. In addition, the balance adjustment hole 38 is the first and second adjustment holes 38A, 38B.
Are formed corresponding to the through holes 32B and 32C of the bottom plate 32, so that, for example, when the engine oil, the transmission oil are replaced, or the engine 13, the radiator 15, the oil cooler 16 and the like are inspected, each adjustment is performed. Hole 38A,
38B and the through holes 32B and 32C can be used to easily perform these operations.

Next, the operation of assembling the revolving frame 31 and the additional weight 37 having the above-described structure will be described.

First, the additional weight 37 is integrally fixed to the rear surface of the bottom plate 32 by welding. At this time,
Both sides of the additional weight 37 in the left and right directions extend widely beyond the portion where the rear plate portion 33B of the left vertical plate 33 and the right vertical plate 34 are welded. Therefore, the additional weight 37 is attached to the bottom plate 32.
Since the portion where the left vertical plate 33 and the right vertical plate 34 are welded can be reinforced, it is possible to prevent the bottom plate 32 from causing welding distortion when the left vertical plate 33 and the right vertical plate 34 are welded. it can. After the left vertical plate 33 and the right vertical plate 34 are welded to the bottom plate 32 in this manner, the swivel frame 31 can be assembled by welding the upper plate 35 to the upper portions of the vertical plates 33 and 34.

The hydraulic excavator according to the present embodiment has the above-mentioned structure. By operating the operating levers 23 and 24, the lower traveling body 1 is caused to travel and the working device 4 is operated.
There is no particular difference from the prior art in that the excavation work of earth and sand etc. is carried out using.

However, according to the present embodiment, the additional weight 37 provided on the rear side of the lower surface of the bottom plate 32 of the revolving frame 31 is provided with the rear plate portion 33B of the left vertical plate 33 and the right vertical plate 34 standing upright. The width W2 is wider than the width W1 in the left and right directions. Therefore, before welding the left vertical plate 33 and the right vertical plate 34 to the bottom plate 32 of the revolving frame 31, the additional weight 37 is integrally fixed to the bottom surface rear side of the bottom plate 32 by welding to form a heavy object. The bottom plate 32 can be reinforced by the strong additional weight 37. As a result, each vertical plate 3 is attached to the bottom plate 32.
It is possible to suppress welding distortion when welding 3, 34 is small.

As a result, since the welding distortion of the bottom plate 32 can be suppressed to a small level, a plurality of brackets (not shown) attached to the bottom plate 32 can be held in a proper posture. Accordingly, when the outer cover 21 is attached to each bracket, the outer cover 21 can be correctly attached to a predetermined place, and thus the outer cover 2
It is possible to improve productivity by omitting the work for adjusting the seams such as 1.

In addition, the additional weight 37 includes the engine 1
Since the balance adjusting hole 38 is provided on the lower side of the third plate 3, when the additional weight 37 is attached to the bottom plate 32,
Since the balance adjusting hole 38 of the additional weight 37 averages the entire weight balance, it is possible to prevent the load from being concentrated on a part of the bottom plate 32 and improve the durability of the revolving frame 31. . Moreover, since the balance adjusting hole 38 is provided on the lower side of the engine 13, the balance adjusting hole 38 is used when performing maintenance work or inspection work on the engine 13, the radiator 15, the oil cooler 16, etc., for example. It can be performed easily and workability can be improved.

In the embodiment, the case where the present invention is applied to the hydraulic excavator provided with the canopy 22 covering the upper side of the driver's seat 20 has been described as an example, but the present invention is not limited to this, and the surroundings of the driver's seat 20. It may be applied to a hydraulic excavator having a cab box that covers the.

Further, in the embodiment, a cooling fan (not shown) driven by the engine 13 is provided on the right end side of the engine 13, and the radiator 15 and the oil cooler 16 are arranged facing the cooling fan. The hydraulic excavator was explained as an example. However, the present invention is not limited to this,
For example, a radiator 15 and an oil cooler 16 are used for the engine 1
It may be applied to a hydraulic excavator which is arranged at a place different from that of No. 3 and supplies cooling air thereto by a cooling fan driven by an electric motor or the like.

Further, in the embodiment, a track-type hydraulic excavator has been described as an example of the turning type construction machine.
The present invention is not limited to this, and can be applied to other swing-type construction machines such as wheel-type hydraulic excavators.

[0042]

As described in detail above, according to the first aspect of the present invention, the additional weight located on the rear side of the revolving frame and fixed to the lower surface of the bottom plate is the left vertical plate and the right vertical plate of the revolving frame. The plate is formed wider in the left and right directions than the horizontal width where the plate is erected. Therefore, before welding the left vertical plate and the right vertical plate to the bottom plate of the swivel frame, additional weights are integrally fixed to the rear side of the lower surface of the bottom plate by using a welding means, so that a strong body formed as a heavy object is formed. The additional weight can reinforce the portions where the vertical plates of the bottom plate are welded on both sides thereof.
Therefore, the additional weight can reduce distortion of the bottom plate when welding the vertical plates. As a result, for example, the brackets and the like attached to the bottom plate can be held in an accurate posture, so that the exterior cover and the like attached to the brackets can be accurately attached to a predetermined location, and adjustment work of these can be performed. Can be omitted to improve productivity.

According to the second aspect of the present invention, the engine is provided on the rear side of the revolving frame in front of the counterweight, and the additional weight is placed on the lower side of the engine to average the entire weight balance. The balance adjustment hole for making Therefore, when the additional weight is attached to the bottom plate of the revolving frame, the balance adjustment holes formed in the additional weight average out the weight balance of the entire weight, so that it is possible to prevent the load from being concentrated on a part of the bottom plate. The durability of the swivel frame can be improved. Moreover, since the balance adjustment hole is provided on the lower side of the engine, the balance adjustment hole can be easily used when performing maintenance work (engine oil replacement work, etc.) or inspection work on the engine, for example. Therefore, the workability can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing a revolving frame and an additional weight according to an embodiment of the present invention.

FIG. 2 is a front view showing a revolving frame and an additional weight.

FIG. 3 is a right side view showing a revolving frame and an additional weight.

FIG. 4 is a bottom view showing a revolving frame and an additional weight.

FIG. 5 is an external perspective view showing the additional weight as a single body.

FIG. 6 is a front view showing a hydraulic excavator applied to a conventional technique.

FIG. 7 is a plan view showing the upper revolving structure with a driver's seat, an exterior cover, a canopy and the like removed.

FIG. 8 is a plan view showing a revolving frame and an additional weight.

FIG. 9 is a front view showing a revolving frame and an additional weight.

FIG. 10 is a right side view showing the swivel frame and the additional weight.

FIG. 11 is a bottom view showing the swivel frame and the additional weight.

[Explanation of symbols]

1 Undercarriage 2 Upper revolving structure 4 working equipment 11 counterweight 13 engine 31 swivel frame 32 Bottom plate 33 Left vertical plate 34 Right vertical plate 37 Additional weight 38 Balance adjustment hole W1 Horizontal width between the rear plate of the left vertical plate and the right vertical plate W2 width of additional weight

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shogo Kimura             1-2, Sasagaoka, Mizuguchi Town, Koga District, Shiga Prefecture             Hitachi Construction Machinery Tierra Shiga Factory (72) Inventor Kenichiro Nakatani             1-2, Sasagaoka, Mizuguchi Town, Koga District, Shiga Prefecture             Hitachi Construction Machinery Tierra Shiga Factory (72) Inventor Koji Yoshimasu             1-2, Sasagaoka, Mizuguchi Town, Koga District, Shiga Prefecture             Hitachi Construction Machinery Tierra Shiga Factory (72) Inventor Bunsho Saeki             1-2, Sasagaoka, Mizuguchi Town, Koga District, Shiga Prefecture             Hitachi Construction Machinery Tierra Shiga Factory F-term (reference) 2D015 FA01

Claims (2)

[Claims] 1. A self-propelled undercarriage, an upper revolving structure rotatably mounted on the lower revolving structure, and a work device provided on the front side of the upper revolving structure so as to be able to lift and lower. The upper revolving structure includes a bottom plate and a left vertical plate that extends forward and rearward on the upper surface of the bottom plate and is erected at right and left intervals.
A revolving frame having a right vertical plate, a counterweight provided on the rear end side of the revolving frame for balancing the weight of the working device, and fixed to the lower surface of the bottom plate located on the rear side of the revolving frame. In the swivel type construction machine including the additional weight, the additional weight is formed to be wider in the left and right directions than the lateral width in which the left vertical plate and the right vertical plate of the swivel frame are erected. Slewing type construction machinery. 2. An engine is provided on the rear side of the revolving frame in front of the counterweight, and an engine is provided on the additional weight below the engine to balance the overall weight balance. The swing-type construction machine according to claim 1, wherein a balance adjusting hole is provided.